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Dual Nozzle Ink Jet Printer

Publishing Venue

IBM

Related People

Fowler, RL: AUTHOR

Abstract

Various arrangements are described for ink jet printing, wherein a pair of nozzles are arranged to produce ink drops that are emitted in a controlled manner to collide or miss in various patterns, in order to print dots on paper or other material or not print, as desired.

Country

United States

Language

English (United States)

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Dual Nozzle Ink Jet Printer

Various arrangements are described for ink jet printing, wherein a pair of
nozzles are arranged to produce ink drops that are emitted in a controlled
manner to collide or miss in various patterns, in order to print dots on paper or
other material or not print, as desired.

In Fig. 1, two nozzles are aimed in an X pattern. If a dot is desired on the
paper the nozzles emit drops that collide, coalesce and proceed to the paper. If
a dot is not desired, the nozzles emit drops that miss each other and proceed to
two troughs (buckets). Another arrangement is shown in Fig. 2. Many variations
of the basic scheme are possible. These are discussed below.

A. One pair of constant-voltage vertical-deflection plates, two variable-
voltage charging electrodes, one for each nozzle. Note that vertical deflection
plates deflect the droplets vertically, but are themselves horizontal. Likewise,
horizontal deflection plates deflect horizontally but are themselves vertical. Four
possibilities exist.

1) When a dot is desired, each drop is charged the same for the proper
deflection. Upon colliding, they coalesce and proceed to the paper. If the dot is
not wanted, one drop is charged differently such that the two drops miss each
other and proceed to the buckets.

2) This scheme is different from the rest in that the drops are
always aimed to collide. If a dot is wanted, proceed as in (A1)
above. If a dot is not wanted, both drops are charged equally but to
a higher level, so that when they collide they bounce apart and
proceed to the buckets. Several reasons exist for this possibility.
One is that like charges repel. Another is that the surface area of
one drop formed by two drops (of equal size) is 79.3% less than the
area of the initial two drops. This means that the charge/unit area
goes up and if high enough, the drop(s) could form into smaller
drops. Hope...